Essays about: "gratings"

Showing result 16 - 20 of 21 essays containing the word gratings.

1. 16. Optical Time Domain Reflectometer based Wavelength Division Multiplexing Passive Optical Network Monitoring

   University essay from KTH/Skolan för informations- och kommunikationsteknik (ICT)

   Author : AGEREKIBRE GETANEH WORKALEMAHU; [2012]
   Keywords : Optical time domain reflectometer; fault detection and localization; arrayed waveguide grating;

   Abstract : This project focuses on wavelength division multiplexing passive optical network (WDM-PON) supervision using optical time domain reflectometer (OTDR) for detection and localization of any fault occurred in optical distribution network. The objective is to investigate the impact of OTDR monitoring signal on the data transmission in the WDM-PON based on wavelength re-use system, where the same wavelength is assigned for both upstream and downstream to each end user. READ MORE

3. 17. Investigation of nanophotonic devices based on transformation optics : Transforming reflective optical devices

   University essay from KTH/Skolan för informations- och kommunikationsteknik (ICT)

   Author : Glenn Mangelinckx; [2011]
   Keywords : ;

   Abstract : Transformation optics (TO), which provides an elegant way of molding the flow of light to one's wishes, has become one of the most popular photonics research areas during the last few years. Owing to stringent material parameters of transformation media, TO is in general not favourable for designing practical applications. READ MORE

4. 18. Influence of selective proton exchange on periodically poled lithium niobate

   University essay from KTH/Laserfysik

   Author : Michele Manzo; [2010]
   Keywords : ;

   Abstract : The purpose of the present thesis is to study the influence of Proton Exchange on Electric Field assisted Poling of congruent Lithium Niobate and its applications on periodically patterned structures. Moreover, the possibility of using Proton Exchange to avoid neighbours domains merging is studied and successfully demonstrated for period shorter than 10μm. READ MORE

5. 19. Influence of selective proton exchange on periodically poled lithium niobate

   University essay from KTH/Kvantelektronik och -optik, QEO

   Author : Michele Manzo; [2010]
   Keywords : ;

   Abstract : The purpose of the present thesis is to study the influence of Proton Exchange on Electric Field assisted Poling of congruent Lithium Niobate and its applications on periodically pat-terned structures. Moreover, the possibility of using Proton Exchange to avoid neighbours domains merging is studied and successfully demonstrated for period shorter than 10μm. READ MORE

6. 20. Automatic trimming of ultrasonic pulse in fiber-optical power spectrometer

   University essay from Signaler och System

   Author : Ola Forsslund; [2009]
   Keywords : spectrometer; fiber brag gratings; fiber optics; automation; LabVIEW; ultrasonic pulse; mechanical pulse;

   Abstract : The aim of this master's thesis is to develop a method that fully automates a trimming step in the production of a fiber-optical power spectrometer, based on a unique Acusto-Optical Scanning Filter. The filter is created by letting an ultrasonic mechanical pulse pass through a chirped Fiber Bragg Grating. READ MORE